1Cor 15:22-23 For just like with Adam, all die, so also with the Messiah of Israel all will be made alive at the Resurrection. But each in his own order: the Messiah, the Firstfruits; afterward, at his coming, the People of the Messiah.
The word "order" in this verse is the Greek word "tagma". It means that which has been arranged, ranked or ordered, a series, or succession.
"Tagma" is the key to understanding the Fifteenth Chapter of Corinthians. As we read through this chapter we are shown events in temporal succession.
1Cor 15:24-28 Then cometh the end, when he shall have delivered up the Kingdom to YHVH, even the Father; when he shall have put down all rule and all authority and power. Because the Messiah must reign until the Father hath put all enemies under his feet (Psa 110:1-2). The last enemy that shall be destroyed is death. Therefore the Father hath put all things under the Messiah's feet. But when He saith all things are put under him, it is manifest that YHVH is excluded (who did put all things under the Messiah). And when all things shall be subdued unto him, then shall the Son also himself be subject unto Him that put all things under him, that YHVH may be all in all.
1Cor 15:29 Else what shall they (notice, Paul does not say, "we") do which take a ritual bath for the dead, if the dead rise not at all (vs. 17-18)? why do they then take a ritual bath for them?
There are three things to consider when making sense of verse 29:
1. The Resurrection involves the descendants of Abraham, Isaac, and Jacob. The dead cannot change their DNA.
2. All Israel will be resurrected whether or not there is a baptism.
3. Baptism is a ritual foreshadowing the Resurrection.
1Cor 15:35-44 But someone will say, "How are the dead raised? What kind of body will they have when they come?" Foolish one! What you sow does not come to life unless it dies. And as for what you sow--you are not sowing the "future body", but only a seed, perhaps of wheat or another grain. But Elohim gives it a body as He wants, and to each of the seeds its own body. (Paul continues the "tagma" by recounting the days of Creation to convey his line of reasoning). Not all flesh is the same flesh; there is one flesh for humans, another for animals, another for birds, and another for fish. There are celestial bodies and terrestrial bodies, but the splendor of the celestial bodies is different from that of the terrestrial ones. There is a splendor of the sun, another of the moon, and another of the stars; for star differs from star in splendor. So it is with the resurrection of the corpse: Sown in the grave to decay, raised imperishable (sown in dishonor, raised in glory; sown in weakness, raised in power). It is sown a body that can decay; it is raised a body that does not decay. There is a body that is corruptible, and there is a body that is incorruptible.